Discharge-valve.



W; F. RUWELL.

DISCHARGE VALVE.

APPLICATION FILED FEB.11, 1914.

1,1205%5 I Patented Dec. 8, 1914.

warren s'm'rns Pia-TENT orsron.

VWILLIAM FIR UWELL, or PHILADELPHIA, PENNSYLVANIA.

menses.

T all whom it may concern Be it known that I, lVILLIi-ur F. RUwELL,

a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Discharge-Valves,

of which the following is a specification.

My invention consists of an improved form of a discharge valve and is particularly designed for use in gas compressors for refrigerating machines.

()no object of my invention is to make a discharge valve of the above described type, which will freely open to allow sullicient space for the proper discharge of the gas from the compressor cylinders; another object being to prevent pounding or rattling which is ordinarily caused by the vibration of the valve.

)1 still further object is to so construct the parts of the valve as to prevent them from dropping into the compressor cylinder if they should become broken.

' These and other objects and advantages which will be described hereinafter I attain B gin the following manner, reference being bad to the accompanying drawings in which,

Figure 1, is a sectional elevation of sufficient of a gas compressor illustrating my invention as applied thereto; Fig. 2, is a sectional plan taken on the line aa Fig. i; -iig. 3, is an elevation view of the casing which I employ; and Fig. at, is a sectional elevation showing a modified form of my invention.

Referring to the drawings, 1 is a compressor cylinder having the plunger 2 operable therein in the ordinary manner. The cylinder head 3 is secured to the cylinder 1 and has a passage therein which connects a chamber 5 and the compression chamber 6. An annular shoulder 7 forms a support for a valve seat ring 8 which in turn, forms a support for an undercut ring 9 in the pres- Specification of Letters Patent.

ent instance cast integral with the valve cas- DISCHARGE-VALVE.

' Patented Dec. 8, 1914.

Application filed February 11, 1914. Serial No. 818,106.

compression spring 16; which acts between the upper part of the valve casing and said valve to keep the latter seated. A port 17 is formed in the depending sleeve 12 to connect the back pressure chamber mad the cushion chamber 18 in the casing 10. This portlT is so positioned that, when the valve 15 is seated, its inner end enters the cushion chamber 18 between the top 19 of the valve stem and the top of the cushion chamber (Fig. 1). A bonnet 20 is secured to the cylinder head 3 by bolts 21 and has an annular depending flange 22 which rests partly on a shoulder 23 of the valve casing and partly ,on a shoulder 24 of the cylinder head. '1 preferably place a lead or other suitable gasket 25 under the flange 22 to permitthe proper assembly of the parts. By this construction the valve casing is rigidly secured and cannot be tilted or distorted even though one of the bolts 21 is set up tion of the valve casing, join the sleeve 12 at points adjacent the bottom thereof and at such a distance away from the valve seat ring 8 that if the valve stem should break it would be impossible for the valve proper to be thrown by the action of the compressor very far out of its proper position, since such action would be effectually prevented by said ribs. The advantage of this construction will be appreciated by those skilled in this art, since valve-stems frequently break and the broken valves are forced entirely from the seat while the stems drop into the compression cylinders causing con siderable damage.

The operation is as follows: Gas having been admitted into the compression chamher 6, by means of a suction valve (not shown) is compressed by the upward movement of the plunger 2 until its pressure hecomes greater than the downward pressure exerted on the valve 15, at which time the valve 15 will be moved quickly olf its seat until the portion 19 of the stem has passed and thereby closed the port 17. A cushion is thus formed within the casin 10 and the interior of the valve stem 14 which will prevent the pounding or vibration of the valve 4 and determine the proper distance the latter should open. After the plunger 2 has discharged all the gas from the chamber 6 the valve 15 is quickly seated, under the action of the spring 16, the back pressure of the valve, and the pressure of the gas which is cushioned in the chamber 18. It will thus be seen that by constructing the valve as described it freely opens under operating conditions until the portion 19 of the valve stem cuts oil the port 17 and will thereafter quickly close when all the gas been discharged from the compression chamber. Also by having the rim 9 secured to or made integral with the legs 13 which extend from the upper portion of the valve casing, it is practically impossible for the valve to get out of proper relation to its seat even when the stem breaks.

By providing the valve casing with the port 17 so placed as to be closed by the valve stem after the valve has opened it is unnecessary to use an additional cushion spring such as is required by other valves of the same general class. a

In Fig. 4 I have shown a construction in which the valve seat is formed by a portion integral with the valve casing. The valve casing 10 being made in two sections 26 and 27. The section 26 has a ring1 portion 28 providing the valve seat, and as arms 29 projecting upwardly therefrom. .The section 27 provides the cushion chamber 30 and has downwardly projecting arms '31'immediately adjacent the arms 29. This casing has a port 32 and performs the functions of the casing 10 and the valve-seat ring'8 combined.

I claim c l. The combination of a valve casing having a downwardly projecting annular flange; a ring positioned below the bottom of the annular flan e; ribs connecting the flange and ring; an a valve having astem slidable within the flange and having its head movable through said ring.

' 2. The combination of a valve casing having a downwardly projecting annular flange forming a chamber; a ring positioned below the bottom of said flange; ribs extending downwardly from the flange and connecting the flange and ring; and a valve having a stem slidable within said chamber.

3. The combination of a valve casing having a downwardly projecting annular flange forming a chamber; a ring positioned below the bottom of said flange; ribs extending downwardly from the flange and connecting the flange and ring; a valve having a stem slidable within said chamber; and a second ring forming a valve seat and positioned below said first ring.

a. The combination of a compressor cylinder; a head thereon having a discharge chamber and a passage communicating with the cylinder; avalve casing having its upper portion engaging the upper part of the head and provided with an annular flange extending downwardly Within the discharge chamber; a ring fitting the passage in the head; ribs connecting said flange and ring; with a valve movable through the ring and having a stem operable within the flange.

5. The combination'of a compressor cylinder; a head thereon having a discharge chamber and a passage communicating with the cylinder; a valve casing having its upper portion engaging the upper part of the head and provided with an annular flange extending downwardly within said chamber; a ring positioned below the bottom of said flange and fitting the passage in the head; ribs connecting said flange and ring; and a valve having a stem operable within the flange.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

WILLIAM F. RUWELL.

Witnesses:

AUGUs'rUs B. CoPPEs, Jos. H. KLEIN. 

